<template>
  <div
    class="com-container"
    @dblclick="revertMap"
  >
    <div
      class="com-charts"
      ref="map_ref"
    >
    </div>
  </div>
</template>

<script>
import { mapState } from "vuex";
import axios from "axios";
import { getProvinceMapInfo } from "../utils/map_utils";
export default {
  data() {
    return {
      echartInstance: null, //echarts实例化对象
      allData: null, //服务器获取的所有数据
      mapData: {}, //获取省份矢量地图的数据的缓存
    };
  },
  components: {},
  mounted() {
    this.initecharts(); //初始化图表
    this.getData(); //获取数据
    //屏幕大小监听事件
    window.addEventListener("resize", this.screenAdapter);
    this.screenAdapter();
  },
  methods: {
    //初始化数据
    async initecharts() {
      this.echartInstance = this.$echarts.init(this.$refs.map_ref, "chalk");
      //获取map的数据
      //http://localhost:9091/static/map/china.json
      const ret = await axios.get(
        "http://localhost:9091/static/map/china.json"
      );
      this.$echarts.registerMap("china", ret.data); //初始化地图数据
      //console.log(ret);
      const creatOption = {
        //标题
        title: {
          text: "▎商家分布",
          // textStyle:{
          //   fontSize: 60,
          // },
          left: 30,
          top: 20,
        },
        geo: {
          type: "map",
          map: "china",
          top: "5%",
          bootom: "5%",
          itemStyle: {
            areaColor: "#2E728F",
            borderColor: "#333",
          },
        },
        legend: {
          left: "5%",
          bottom: "5%",
          orient: "vertical",
        },
      };
      this.echartInstance.setOption(creatOption);

      //地图点击事件
      this.echartInstance.on("click", async (arg) => {
        //获取到的是中文
        //console.log(arg);
        const provinceInfo = getProvinceMapInfo(arg.name);
        //console.log(provinceInfo);

        //获取地图的矢量数据
        //判断mapData是是否存在省份矢量数据的缓存
        if (!this.mapData[provinceInfo.key]) {
          const ret = await axios.get(
            "http://localhost:9091" + provinceInfo.path
          );
          this.mapData[provinceInfo.key] = ret.data;
          this.$echarts.registerMap(provinceInfo.key, ret.data);
        }
        const changeOption = {
          geo: {
            map: provinceInfo.key,
          },
        };
        this.echartInstance.setOption(changeOption);
      });
    },
    //获取数据
    async getData() {
      const { data: ret } = await this.$axios.get("map");
      this.allData = ret;
      this.updateChart();
    },
    //图例展示(处理数据)
    updateChart() {
      //处理图表需要的数据
      //图例数据
      const legendArr = this.allData.map((item) => {
        return item.name;
      });

      const seriesArr = this.allData.map((item) => {
        //return的这个对象就代表的是一个类别下的所有散点数据
        return {
          type: "effectScatter", //散点图
          //涟漪效果
          rippleEffect: {
            scale: 5,
            brushType: "stroke",
          },
          name: item.name,
          data: item.children,
          //如果想在地图上显示散点的数据，所有我们需要给散点的图表增加一个配置，coordinateSystem:geo
          coordinateSystem: "geo",
        };
      });
      const dataOption = {
        legend: {
          data: legendArr,
        },
        series: seriesArr,
      };
      this.echartInstance.setOption(dataOption);
    },
    //适配器自适应
    screenAdapter() {
      const titleFontSize = (this.$refs.map_ref.offsetWidth / 100) * 3.6;
      const adapterOption = {
        //标题
        title: {
          textStyle: {
            fontSize: titleFontSize,
          },
        },
        legend: {
          itemWidth: titleFontSize / 2,
          itemHeight: titleFontSize / 2,
          itemGap: titleFontSize / 2, //图例标题间隔
          textStyle: {
            fontSize: titleFontSize / 2,
          },
        },
      };
      this.echartInstance.setOption(adapterOption);
      // 手动的调用图表对象的resize 才能产生效果
      this.echartInstance.resize();
    },
    //双击货到map
    revertMap() {
      const revertOption = {
        geo: {
          map: "china",
        },
      };
      this.echartInstance.setOption(revertOption);
    },
  },
};
</script>

<style lang='less' scoped>
</style>
